Application HR17B series fuse type load isolating switch can be operated with load and is applicable to rated current 100A~1600A, and has three types: one-gang, two-gang and three-gang. It can be installed both to bus bar and solid plate, and supplies with upper end input, lower end input and output structure, lead in device with cutting point and arc extinguishing equipment. Furthermore, switch cover has sealed sensing hole aperiodically, signal switch and detector switch are built inside. It can match fuse detector and also can be used as knife switch.